I've rewritten this twice now, I'm trying to write it without wittering! 
The long and short is, we've always had dogs, the dc's have always had dogs. This isn't a whim, we lost one of our dogs last year, and now dd's and able to understand not to pester the puppy, we're looking for another.
My question really is, obviously this new member of the family wouldn't just be for Christmas, as I said, it's not a whim, we've always been dog people, and we'd have got another sooner if dd wasn't so young when our eldest dog died. See, wittering again! But is it a terrible idea to get one for Christmas day as a surprise for the dc's? And, knowing the 'not just for Christmas', my duh has said that no reputable breeder would sell puppies at Christmas, is this true?